CN115773082A - Large-size casing pipe section milling tool - Google Patents

Abstract

The invention provides a large-size casing pipe section milling tool which comprises a cylindrical body, wherein a plurality of rectangular grooves are axially formed in the outer wall of the body; the cutter is arranged in the rectangular groove and is expanded or retracted into the rectangular groove from the rectangular groove in the radial direction under the action of thrust; the piston is arranged in the body and stretches and retracts in the axial direction under the action of fluid; wherein the piston stretches and retracts in the axial direction to drive the cutter to expand or retract in the radial direction. When the outer-layer sleeve of the double-layer sleeve is milled in a section mode, the tool can be put into the inner-layer sleeve, and the cutter is driven to extend out in a hydraulic mode to conduct section milling operation; after the operation is finished, the cutter can be retracted into the tool body and is drilled to a wellhead through the inner casing.

Description

Large-size casing pipe section milling tool

Technical Field

The invention relates to a section milling tool, in particular to a large-size casing section milling tool, and belongs to the technical field of petroleum.

Background

As the production time of offshore fields increases, more and more wells continue to go into non-producing conditions, requiring immediate disposal of these non-producing wells to permanently eliminate their potential threat to the environment. The exploration and development of domestic marine oil and gas are started late, but the south China sea, the east China sea and the Bohai Bay all enter a permanent well abandoning stage of the sea to different degrees.

The basic requirements for marine permanent well abandonment include 4 aspects:

(1) Sealing and protecting all fresh water and near fresh water layers; (2) Packing protects all future production zones with commercial exploitation value; (3) preventing leakage and outflow of fluids from the well; (4) And (4) clearing all facilities above the seabed, and cutting off the pipes below the mud line.

The casing pipe with a certain length needs to be milled in sections, and a cement plug is arranged to plug a production layer so as to prevent oil gas leakage. In some cases, all sections of the two layers of the casing pipes need to be milled, and then cement plugs are drilled. Conventional casing section milling techniques require section milling of two casing strings from inside to outside layer by layer. For example, when a 9-5/8 'x 13-3/8' double-layer casing is milled in a section mode, a section milling tool goes down to the target depth from the inside of the 9-5/8 'casing, and a blade section is extended to mill a 9-5/8' casing with a certain length; and (4) removing the drill to the wellhead to replace a section milling tool, then descending the 9-5/8 'casing to a preset depth, and extending out the cutter to section mill a certain length of 13-3/8' casing. The tools for milling 9-5/8' sleeves in sections are relatively mature. However, when a 13-3/8' casing or a casing with a larger size is milled, a section milling tool is required to be capable of being lowered into the inner casing (namely, the outer diameter of the tool is limited by the drift diameter of the inner casing), and a cutter with a sufficient length is required to be extended out to mill the outer casing section, and the conventional section milling tool cannot completely meet the requirements.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a large-size casing section milling tool, when an outer casing in a double-layer casing is section milled, the tool can be put in through the inner casing, and a cutter is hydraulically driven to extend out to perform section milling operation; after the operation is finished, the cutter can be retracted into the tool body and is drilled to a wellhead through the inner casing.

The invention provides a large-size casing pipe section milling tool, which comprises:

the device comprises a cylindrical body, wherein a plurality of rectangular grooves are axially formed in the outer wall of the body;

the cutter is arranged in the rectangular groove and is expanded or retracted into the rectangular groove from the rectangular groove along the radial direction under the action of thrust;

the piston is arranged in the body and stretches and retracts in the axial direction under the action of fluid;

wherein the piston stretches and retracts in the axial direction to drive the cutter to expand or retract in the radial direction.

The invention has the further improvement that the cutter is detachably arranged in the rectangular groove, and the cutter comprises a windowing cutter and a milling cutter;

and when the outer sleeve is cut, the windowing cutter is arranged in the rectangular groove, and when the outer sleeve is milled, the milling cutter is arranged in the rectangular groove.

The invention has the further improvement that the cutter comprises a bar-shaped cutter body, the upper end of the cutter body is connected with the cutter body through a driving rod, and the lower end of the cutter body is connected with the cutter body through a supporting component;

wherein the driving rod and the support assembly radially expand or retract the cutter body by rotating.

The further improvement of the invention is that the outer wall of the cutter body is an arc-shaped surface, cutter teeth are arranged on the outer wall of the cutter body, the cutter teeth of the windowing cutter are a plurality of cutting blocks, and the cutter teeth of the milling cutter are milling columns.

The invention is further improved in that the outer wall of the cutter body is provided with wear resistant strips.

The invention has the further improvement that the driving rod is of a long strip structure with two arc-shaped ends, the upper end of the driving rod is connected with the cutter body through a first pin shaft, a plurality of sawteeth are arranged on the arc-shaped surface of the upper end of the driving rod, and the lower end of the driving rod is connected with the cutter body through a second pin shaft;

the side face of the piston is provided with a plurality of sawteeth which are meshed with the sawteeth of the driving rod, and the driving rod is driven by the sawteeth to rotate along the first pin shaft when the piston stretches.

The invention is further improved in that the support assembly comprises an upper support rod and a lower support rod, the upper ends of the upper support rod and the lower support rod are connected with the cutter body through a group of third pin shafts, and the other ends of the upper support rod and the lower support rod are connected with the cutter body through a group of fourth pin shafts.

The invention has the further improvement that an annular chamber is arranged on the flow passage in the body;

the piston is the tubular structure of notch cuttype, and it includes thick piston cylinder and thin piston tube, and the piston cylinder sets up in cyclic annular cavity, the piston tube extends to in the runner of lower part, and set up on the piston tube the sawtooth.

A further development of the invention is that a spring is arranged in the annular chamber, which spring exerts a spring force between the body and the piston.

The invention is further improved in that the upper end of the body is provided with an upper joint, and the side surface of the upper joint is provided with a plurality of spray nozzles along the radial direction.

The invention is further improved in that hard alloy materials are welded on the lower end conical surface and the bottom surface of the body in a surfacing mode.

A further development of the invention is that the end of the piston tube is provided with a throttle nipple.

Compared with the prior art, the invention has the advantages that:

according to the large-size casing section milling tool, when an outer casing in a double-layer casing is milled in a section mode, the tool can be put into the double-layer casing through the inner casing, and a cutter is hydraulically driven to extend out to perform section milling operation; after the operation is finished, the cutter can be retracted into the tool body and is drilled to a wellhead through the inner casing.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic diagram of a large casing segment milling tool according to one embodiment of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view taken at A-A of FIG. 1;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 1;

FIG. 5 is a cross-sectional view at C-C of FIG. 2;

FIG. 6 is a cross-sectional view taken at D-D of FIG. 2;

FIG. 7 is an isometric view of a windowing tool in accordance with an embodiment of the invention;

FIG. 8 is an isometric view of the open window cutter body of FIG. 7;

fig. 9 is an isometric view of a milling cutter in accordance with an embodiment of the present invention;

FIG. 10 is an isometric view of the milling cutter body of FIG. 9;

FIG. 11 is an isometric view of a drive rod of one embodiment of the present invention;

figure 12 is an isometric view of an upper support pole and a lower support pole of one embodiment of the present invention;

FIG. 13 is a schematic representation of the operation of a large casing section milling tool according to one embodiment of the present invention, showing the outer casing being cut;

FIG. 14 is a schematic diagram of the operation of a large casing section milling tool according to one embodiment of the present invention, showing the milling of the outer casing.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale. The meaning of the reference symbols in the drawings is as follows:

1. the body is provided with a plurality of grooves,

2. the cutting tool is provided with a cutting tool,

3. the piston is provided with a piston rod which is provided with a piston rod,

11. a rectangular groove is formed in the bottom of the groove,

12. an upper joint is arranged on the upper end of the connecting rod,

13. the hard alloy material is made of hard alloy materials,

14. the spray nozzle is arranged on the upper portion of the shell,

15. a spring is arranged on the upper surface of the shell,

16. a sealing ring is arranged on the outer side of the sealing ring,

21. a window-opening cutter is arranged on the upper surface of the cutter,

22. the cutter is ground and milled by the grinding and milling machine,

23. the tooth of the cutter is provided with a tooth,

24. the wear-resistant strips are arranged on the outer wall of the shell,

25. the driving rod is driven by a driving rod,

26. the upper support rod is arranged on the lower support rod,

27. a lower supporting rod is arranged on the lower supporting rod,

211. a window-opening cutter body is arranged on the cutter body,

212. the cutting block is used for cutting the workpiece,

213. a first rectangular groove is formed on the base plate,

214. a second rectangular groove is formed in the first rectangular groove,

221. the body of the cutter is milled and milled,

222. the column is milled and milled, and the milling cutter,

223. a third rectangular groove is formed in the first rectangular groove,

224. a fourth rectangular groove is formed in the first rectangular groove,

251. the saw-teeth are arranged on the upper surface of the frame,

252. a first pin roll is arranged on the first side of the frame,

253. a second pin shaft is arranged on the second side of the first pin shaft,

261. a third pin roll is arranged on the second side of the first pin roll,

264. a fourth pin shaft is arranged at the upper end of the second pin shaft,

31. a piston cylinder is arranged in the piston cylinder,

32. a piston tube is arranged on the piston tube,

33. the throttle valve is arranged on the upper portion of the throttle valve,

41. the inner layer of the sleeve pipe is provided with a sleeve pipe,

42. an outer layer of a sleeve pipe is arranged,

43. and (5) drilling a rod.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, the following describes exemplary embodiments of the present invention in further detail with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 schematically shows a large casing section milling tool according to one embodiment of the invention, comprising a body 1. The body 1 is of a cylindrical structure, and a flow passage is arranged in the body. A plurality of rectangular grooves 11 are radially arranged on the outer wall of the body 1, and in this embodiment, two groups of rectangular grooves 11 are oppositely arranged on two sides of the body 1. And a cutter 2 is arranged in the rectangular groove 11 and is used for cutting the outer sleeve 42 or grinding and milling the outer sleeve. The cutter 2 can be contracted or expanded and is retracted into the rectangular groove 11 when being contracted, so that the tool can be conveniently put down; which when expanded, project radially from the rectangular recess 11 and can be used to cut or mill the casing. The large-size casing section milling tool further comprises a piston 3, the piston 3 extends and retracts in the axial direction under the action of fluid, and the piston 3 extends and retracts in the axial direction to drive the cutter 2 to expand or retract in the radial direction.

When the large-size casing section milling tool according to the embodiment is used, the body 1 is connected to a drill rod and is put down and up to the underground, in an initial state, the cutter 2 is in a state of being contracted into the rectangular groove 11, the pressure received by the piston 3 is controlled by controlling the displacement of fluid, so that the piston 3 is controlled to be contracted and contracted, and when the piston 3 extends out, the cutter 2 is expanded, so that the cutter 2 cuts or mills a casing.

In one embodiment, the tool 2 is removably mounted within the rectangular recess 11, and the tool 2 comprises a windowing tool 21 and a milling tool 21; when the outer sleeve 42 is cut, the windowing cutter 21 is arranged in the rectangular groove 11, and when the outer sleeve is milled, the milling cutter 21 is arranged in the rectangular groove 11.

In the large-sized casing segment milling tool according to the present embodiment, different functions are achieved by providing different types of cutters 2. When the cutting tool is used, a proper cutting tool 2 is selected according to actual requirements, and when the outer-layer sleeve 42 is cut, the windowing cutting tool 21 is selected to be arranged in the rectangular groove 11; when milling the outer casing, a selective milling cutter 21 is mounted in the rectangular recess 11. A variety of different treatment modalities are implemented for casing with one tool.

In one embodiment, the tool 2 comprises a tool body. The cutter body is of a strip-block structure, preferably of a rectangular device, and the shape of the cutter body is matched with that of the rectangular groove 11. Wherein, the lateral wall is the arcwall face. The upper end of the cutter body is connected with the body 1 through a driving rod 25, and the lower end of the cutter body is connected with the body 1 through a supporting component. Wherein the drive rod 25 and the support assembly radially expand or retract the cutter body by rotation.

When the piston 3 stretches, the driving rod 25 is driven to rotate, and when the driving rod 25 rotates, the cutter body is driven to expand or contract from the rectangular groove 11.

In one embodiment, the outer wall of the cutter body is an arc-shaped surface, the outer wall of the cutter body is provided with cutter teeth 23, and the cutter teeth 23 are detachable teeth and can be configured into different shapes and structures. The different types of cutters 2 are otherwise similar, with different portions of the cutter teeth 23. For example, the cutter teeth 23 of the windowing cutter 21 are a plurality of cutting blocks 212, and the cutter teeth 23 of the milling cutter 21 are milling columns 222.

In a preferred embodiment, the outer wall of the tool body is provided with wear strips 24.

In the large-sized casing section milling tool according to the present embodiment, the upper portion of the windowing tool body 2111 is provided with a plurality of rows of first rectangular grooves 213 arranged at intervals, and the middle portion of the windowing tool body 2111 is provided with a protrusion for centering. The protrusions are provided with a plurality of second rectangular grooves 214 which are uniformly distributed along the circumferential direction of the windowing tool body 2111. The cutting block 212 is mounted in the first rectangular groove 213 and the wear strip 24 is disposed in the second rectangular groove 214.

The upper portion of the body 1 of the milling cutter 21 is provided with a plurality of rectangular strips uniformly distributed along the circumferential direction of the body 1 of the milling cutter 21, and the middle portion of the body 1 of the milling cutter 21 is provided with a bulge for righting. A plurality of third rectangular grooves 223 arranged at intervals are formed in one side of the rectangular strip, and a plurality of fourth rectangular grooves 224 uniformly distributed along the circumferential direction of the windowing tool body 2111 are formed in the protrusion. The milling column 222 is disposed in the third rectangular groove 223, and the wear strip 24 is disposed in the fourth rectangular groove 224.

The cutting block 212, milling column 222 and wear strip 24 are made of cemented carbide.

In one embodiment, the driving rod 25 has an elongated structure, and the end surfaces of the driving rod having two ends in arc shapes are preferably semicircular. The upper end of the driving rod 25 is connected with the body 1, and the lower end is connected with the cutter body. In this embodiment, the upper end of the driving rod 25 is hinged to the body 1 by a first pin 252, and the lower end is hinged to the tool body by a second pin 253. The length direction of the drive lever 25 coincides with the axial direction of the body 1, and the width direction coincides with the radial direction of the body 1.

The upper end cambered surface of the driving rod 25 is provided with a plurality of sawteeth. The side of the piston 3 is provided with a plurality of saw teeth which are meshed with the saw teeth of the driving rod 25, and the driving rod 25 is driven to rotate along the first pin shaft 252 through the saw teeth when the piston 3 stretches out and draws back.

In the large-sized casing section milling tool according to the embodiment, the driving rod 25 is driven by the saw teeth to rotate around the first pin 252 during the extension and retraction of the piston 3, and the driving rod 25 and the tool body rotate through the second pin 253. The piston 3 can move to drive the cutter 2 to expand outwards or contract inwards.

In one embodiment, the support assembly includes upper support rods 26 and lower support rods 27, the upper support rods 26 being arranged in pairs on a side adjacent the middle of the tool body, and the lower support rods 27 being arranged in pairs on a side adjacent the lower end of the tool body. In this embodiment, two elongated grooves are provided on both sides of the lower portion of the tool body, respectively, for receiving the upper support bar 26 and the lower support bar 27.

The upper end of the upper supporting rod 26 is hinged with the body 1 through a third pin shaft 261, and the lower end is hinged with the cutter body through a fourth pin shaft 264; the upper end of the lower support rod 27 is also hinged with the body 1 through a third pin 261, and the lower end is hinged with the cutter body through a fourth pin 264.

Preferably, both ends of the upper support rod 26 and the lower support rod 27 are semicircular bodies, the middle parts of the upper support rod and the lower support rod are cuboids, and stepped through holes are formed in the axis direction of the semicircular bodies.

In one embodiment, an annular chamber is arranged on the flow passage inside the body 1, the inner diameter of the annular chamber is larger, and the inner diameter of the lower flow passage is smaller, so that a stepped pore passage is formed. An annular end face is formed between the annular cavity and the lower runner. The piston 3 is a stepped tubular structure, which includes a relatively thick piston cylinder 31 and a relatively thin piston tube 32, the piston cylinder 31 is disposed in the annular chamber, the piston tube 32 extends into the lower flow passage, and the outer wall of the piston tube 32 is provided with the saw teeth. The end of the piston tube 32 is provided with a choke 33, which acts as a throttle and allows the upper part to generate pressure.

In this embodiment, a stepped hole is also formed in the piston 3, so that an upper and lower differential pressure surface is formed, and at the same time, the throttling action of the throttle nipple 33 causes the pressure of the fluid to push the piston 3 to move, and when the fluid flows through the inside, the force for pushing the piston 3 to move can be controlled by controlling the displacement and pressure of the fluid, so as to control the extension and contraction of the piston 3, and further control the opening and contraction of the tool 2.

In a preferred embodiment, a spring 15 is arranged in the annular chamber, said spring 15 exerting a spring force between the body 1 and the piston 3. The lower end of the spring 15 is arranged on an annular end surface formed between the annular cavity and the lower flow passage, the upper end of the spring is arranged on an annular boss at the upper end of the piston 3, upward elastic force is applied to the piston 3, the piston 3 moves downwards when the pressure caused by the displacement of fluid is greater than the elastic force of the spring 15, and the spring 15 pushes the piston 3 to move upwards when the pressure is less than the elastic force of the spring 15.

In a preferred embodiment, the upper end of the body 1 is provided with an upper joint 12, and the side of the upper joint 12 is provided with a plurality of spray nozzles 14 along the radial direction.

In one embodiment, hard alloy material 13 is deposited on the bottom surface and the conical surface of the lower end of the body 1.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.

Claims (12)

1. A large size casing segment milling tool, comprising:

the device comprises a cylindrical body (1), wherein a plurality of rectangular grooves (11) are formed in the outer wall of the body (1) along the axial direction;

the cutter (2) is arranged in the rectangular groove (11), and the cutter (2) is expanded or retracted into the rectangular groove (11) from the rectangular groove (11) in the radial direction under the action of thrust;

the piston (3) is arranged in the body (1), and the piston (3) stretches and retracts along the axial direction under the action of fluid;

the piston (3) extends and retracts in the axial direction to drive the cutter (2) to expand or retract in the radial direction.

2. The large casing section milling tool according to claim 1, wherein the cutter (2) is removably mounted in the rectangular recess (11) and the cutter (2) comprises a windowing cutter (21) and a milling cutter (21);

when the outer sleeve (42) is cut, the windowing tool (21) is arranged in the rectangular groove (11), and when the outer sleeve is milled, the milling tool (21) is arranged in the rectangular groove (11).

3. The large-size casing segment milling tool according to claim 2, characterized in that the cutter (2) comprises a bar-shaped cutter body, the upper end of which is connected to the body (1) through a drive rod (25) and the lower end of which is connected to the body (1) through a support assembly;

wherein the drive rod (25) and the support assembly radially expand or retract the cutter body by rotation.

4. The large-size casing section milling tool according to claim 3, wherein the outer wall of the tool body is an arc-shaped surface, the outer wall of the tool body is provided with tool teeth (23), the tool teeth (23) of the windowing tool (21) are a plurality of cutting blocks (212), and the tool teeth (23) of the milling tool (21) are milling columns (222).

5. The large casing segment milling tool according to claim 4, wherein the outer wall of the cutter body is provided with wear resistant strips (24).

6. The large-size casing section milling tool according to claim 5, wherein the driving rod (25) is a long-strip-shaped structure with two arc-shaped ends, the upper end of the driving rod is connected with the tool body (1) through a first pin shaft (252), a plurality of saw teeth are arranged on the arc-shaped surface of the upper end of the driving rod, and the lower end of the driving rod is connected with the tool body through a second pin shaft (253);

the side face of the piston (3) is provided with a plurality of sawteeth which are meshed with the sawteeth of the driving rod (25), and the driving rod (25) is driven to rotate along the first pin shaft (252) through the sawteeth when the piston (3) stretches.

7. The large casing segment milling tool according to claim 6, wherein the support assembly comprises an upper support bar (26) and a lower support bar (27), the upper ends of the upper support bar (26) and the lower support bar (27) are connected to the body (1) by a set of third pins (261), and the other ends are connected to the cutter body by a set of fourth pins (264).

8. The large casing segment milling tool according to any one of claims 1 to 7, wherein an annular chamber is provided on the flow path inside the body (1);

piston (3) are the tubular structure of notch cuttype, and it includes thick piston cylinder (31) and thinner piston tube (32), and piston cylinder (31) set up in cyclic annular chamber, in piston tube (32) extend to the runner of lower part, and set up on piston tube (32) the sawtooth.

9. The large casing segment milling tool according to claim 8, characterized in that the end of the piston tube (32) is provided with a choke (33).

10. The large casing segment milling tool according to claim 8, characterized in that a spring (15) is arranged in the annular chamber, the spring (15) exerting a spring force between the body (1) and the piston (3).

11. The large casing segment milling tool according to claim 9, characterized in that the upper end of the body (1) is provided with an upper joint (12), and the side of the upper joint (12) is provided with a plurality of spray nozzles (14) in the radial direction.

12. The large-size casing segment milling tool according to claim 10, characterized in that the lower conical surface and the bottom surface of the body (1) are provided with a hard alloy material (13) by overlaying.

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